Computer



O. MALCHER COMPUTER March 29, 1927. 1,622,916

Filed Jan. 20, 1919 6 Sheets-Sheet '1 March 29, 1927.

1 O. MALCHER COMPUTER Filed Jan. 20, l9 l9 6 Sheets-Sheet 2 March 29 2MALCHER COMPUTER Filed Jan. 20; 1919 6 Sheets-Sheet 5 I March 29,1927.

O.MALCHER COMPUTER Filed Jan. 20. 1919 6 Sheets-Sheet 4 o. MALCHERCOMPUTER March 29, 1927.

6 Sheets-Sheet 5 Filed Jan. 20. 1919 I March 29, 1927.

v 0. MALCHER COMPUTER Filed Jan. 20, 1919 6 Sheets-Sheet 6 Patented Mar.29, 1927.

PATENT OFFICE.

OTTO MALCHER, OF CHICAGO, ILLINOIS.

COMPUTER.

Application filed January 20, 1919. Serial No. 271,993.

' show features of the interior construction;

F ig. 2 is a fragmentary vertical sectional view showing a portion ofthe operating mechanism Fig. 3 is a view similar to Fig. 2, but showingthe operating mechanism in the position it occupies at a differentperiod in the computing operation from that shown in Fig. 2;

Fig. 4 is a view similar to Figs. 2 and 3, but looking at the parts inan opposite direction from that of Figs. 2 and 3;

Fig. 5 is a fragmentary horizontal sectional View;

Figs. 6, 7 and 8 illustrate details of construction; and

Fig. 9 is a vertical sectional view showing the paper feed and othermechanism.

In the embodiment of the invention illustrated in the drawings, a shaft10 is supported by frame plates 11 which are spaced from one another andheld in upright position. A casing 12 encloses the greater part of theoperating mechanism.

Pivotally mounted on thenshaftl0 and extending rearwardly therefrom area plurality of bars arranged in sets oii'three, each set comprising asupporting bar 14, a driving bar 15, and a. locking bar 16. Generallyspeaking, each of the supporting bars 14 is provided with a main drivinggear 17 pivotally mounted at 18 near the forward end of the bar, whileeach of the operating bars is provided with a rack 19 arranged to meshwith the gear 17. Each of the drive wheels '17 operates a nluneral wheelof one decimal order of the printing mechanism, and also of theaccumulator in a manner to be described. The drive wheel 17 itself isrotated an amount proportional to the digit of the decimal order towhich the numeral wheel belongs by movement of the corresponding rack19. The rack 19 is moved relative to the gear 17 an amount proportionaltothe digit to be set up in the corresponding decimal order by one of aseries of keys carried on the bar 15. After the bar 15 and rack 19 havemoved downwardly a sufficient distance to set up the desired number inthe printing and computing mechanism, the bars 1 1 and 15 are caused tomove downwardly in unison with one another a further distance to printthe number set up in the particular decimal order to which the barscorrespond. Thus by simply pressing the proper key in a given decimalorder on the keyboard the number which that key bears is added to thecorresponding decimal order in the accumulator and printed in its properposition in the tabulated result. The details of the mechanism andoperation, together with other functions of the machine will appear inthe detailed description which follows.

Keyboard and swinging bars.

Each of the supporting bars 1 1 is provided at the end opposite theshaft 10 with a spring 20 which normally swings the bar upwardly aboutthe shaft 10. Each bar 15 carries an arcuate segment 21, to the lowerend of which is secured a coil spring 22, shown in Fig. 2, which springnormally swings the bar 15 upwardly about the shaft 10. EX- tendingdownwardly and rearwardly' from the upper end of each segment 21 andhaving its lower end connected with the bar 15 is a. stepped plate 23having aseries of keys 24c pivotally mounted at 25 on the plate. Ea chkey 24 is provided with a tail piece 26 having a projection 27 at itslower end ar ranged to engage a stop shoulder 28 on the lower edge ofthe plate Springs 29 normally hold the lugs 27 against theircorresponding stop shoulders and hold the keys 2 1- in raised position,as shown in Fig. 2. The locking bar 16 lies adjacent its corre: spondingbar 14; and is provided with a series of laterally extending lugs 30,there being one lug 30 for each of the keys 24. When a key 2 L ispressed downwardly it first extends the spring 29 until the key liesfiat upon the corresponding step of the plate 23, as shown in Fig. 3,Further pressure upon the key 24 will the spring 2-2 and cause the barto swing downwardly about the shaft 10 until the lower end of the tailpiece 26 of the depressed key strikes the corresponding laterallvprojecting lug 30 on the locking bar 1, as shown clearly in Fig. 4. Aseries of lugs 31 are struck laterally from the locking bar 16, each lugbeing so located on the locking bar that the projection 27 on aparticular tail piece 26 will pass on the left of its corresponding lug,as viewed in Fig. l, when a key is depressed and the bar 15 moveddownwardly by the pressure of the depressed key. The lug 31 precludesany possibility of the end of the tailpiece slipping to the right on theprojection 30 and thus permitting the depressed key to move downwardlywithout carrying the projection 30 and the locking bar downwardly inunison therewith. The keys 2-l that are not depressed can pass to theright of their corresp'ondinglugs 31, as viewed in Fig. 4, so that theyare free to swing upwardly about their pivotal connection with the bar15 and do not exert.- pressure upon their corresponding lugs 30. In thisway only the particular key depressed will operate upon the bar 16, andsince the different keys of each decimal order are spaced at graduateddistances from the lugs 30 on the bar 16, it is apparent that the bar 15will be moved downwardly a distance correspond ing to the number on theparticular key de pressed before the key will contact with the bar 16.It is during this downward movement that the corresponding gear 1'? isrotated by the rack 19 to set the numeral wheels of the particulardecimal order. Since the rack 19 moves in unison with the stepped plate23, it is apparent that the numeral thus set up will correspond to theparticular key depressed.

Accumulator.

In order to totalize a series of numbers formed by depressing the properkeys an accumulator is provided having a series of numeral wheels 32which are visible through an opening 33 in the casing 12 shown inFig. 1. The numeral wheels 32 are freely rotatable on a sha't 3i andeach wheel has rigidly connected therewith a pinion 35 which meshes withan idler 36 carried on a shaft 37. Each of the idlers 36, meshes withatwcnty-toothed gear 38 mounted to rotate on a shaft 39. Each of thepinions 35 and 36 is provided with ten teeth so that the numeral wheel32 will make two revolutions for each revolution of the gear 38. Thegear 38 in turn is driven by a ten-toothed pinion 40 which meshes withan idler all mounted on the bar 1% and driven by the gear 17 when thebar 1% is in its uppermost position, as shown in Fig. 3. Through thischain of gearing the numeral wheel 32 is driven an amount proportionalto the numher on the key of the corresponding decimal order which isdepressed. In order to give a correct total of a series of numbers setup in the keyboard it is necessary, however, to carry from one decimalorder to the next higher whenever the numeral wheel of the lower orderpasses from nine to zero. This carrying mechanism is connected with thetwenty-toothed gear 38 mounted on the shaft 39. Each gear 88 has rigidlyconnected therewith a twenty-toothed star wheel 42 and two discs l3 and4d. two teeth of the star wheel being illustrated in Fig. 2. The discsat?) and 44: have their peripheries cut away. as shown in Figs. 2 and 8.to a depth corresponding to the depth of the teeth on the gear 38. andfor a circumferential distance a little less than half the circumferenceof the disc. The two discs are so positioned relative to one anotherthat the parts not cut away overlap one another at each end a distanceequal to the width of a tooth on the gear Arranged to mesh with thediscs 4-3 and -14, respectively. are two mutilated pinions 4:5 and 4.6,each pinion having the alternate teeth omitted, and the two pinionsbeing arranged side by side and arranged so that the teeth of onealternate with the teeth of the other. The teeth on each of themutilated pinions are s0 proportioned that when the pinion lies oppositethe uncutaway portion of the corresponding disc '43 or ll, the pinionwill be locked against rotation. At the same time a tooth on the pinionnot thus locked will extend into the cut-away portion of the other disc,as shown in Fig. 2. It will be apparent that when the discs 43 and 4sthave rotated a half revolution from the position shown in Fig. 2, thetooth on the pinion l5 will engage the end of the slot formed bythecut-away portion in the disc 43, and at the same time the cutawayportion in the disc allwill be brought into position to receive the nexttooth in the pinion 46. Thus for each half revolution of the gear 38,the two mutilated pinions if and a6 will be rotated the width of onetooth, and at all other times the mutilated pinions will be lockedagainst rotation. Since each half revolution of the gear 38 correspondsto a complete revolution of the numeral. wheel the movement of themutilated pinions takes place once for each rotation of the numeralwheel The mutilated pinions 45 and 46 mesh with an clongated pinion 4-7which extends laterally a. suliicient distance, as shown in Fig. 5, tomesh with a ten-toothed pinion 48 which is loosely mounted on a shaft4-9 which carries the mutilated pinions i5 and 46. The pinion -'l8meshes with the twenty-toothed gear 38 of the next higher decimal order.When the elongated pinion l? is in mesh with the mutilated pinions 45and 46 and with the ten-toothed pinion 48, the three pinions 45, 46 and48 will rotate in unison with one another, and with the pinion 47 as ifthey were simple spur gears. In this way each time the mutilated pinionsare ro tated a space corresponding to one tooth by the discs 43 and 44,the pinion 48 will be rotated a corresponding amount, and since thepinion 48 meshes with the gear 38 of the next higher decimal order, aarrying operation will be accomplished.

It will be readily understood that when a key of any particular decimalorder has been pressed and during the rotation of the gear wheel 38 ofany particular decimal order, that gear wheel should be connectedthrough the carrying mechanism with the corresponding gear wheels ofhigher decimal orders, but should be disconnected from those of lowerdecimal rders. To accomplish this the elongated pinion .47 is moved outof mesh with the mutilated pinions 45 and 46 which connect with thecarrying discs of a lower order during the operation of the gear 38 ofthe order corresponding to the key depressed. The pinions 47 are eachcarried at the upper end of a dog 51 which is pivotally mounted on ashaft 52 extending transversely of the casing. A spring 53 normallytends to rotate the dog 51 about the shaft-52 to bring the pinion 47into mesh with the pinions 45, 46 and 48, and these pinions are held inmesh by the spring 53, except when the operating bar of a particulardecimal order is depressed. \Vhen this occurs the dog 51 is rocked intothe position shown in Fig. 3 to disengage the pinion 47 which connectsthe wheel 38 of the decimal order corresponding to the bar depressedwith the carrying discs of the next lower decimal order. The movement ofthe dog 51 is produced by a cam bar 54 which lies adjacent the rack bar19 and which is carried by the operating bar 15 and moves in unison withthe rack bar. The lower end of the dog 51 is provided with a Contactpoint 55 which is arranged to bear against the cam bar 54 and which. ismoved to the right, as viewed in Fig. 3, by the cam bar at the beginningof the downward movei'nent of the operating bar 15. This disengages thepinion 47 prior to any rotation of the gear 38 produced. by the downwardmovement of the operating har.

As will be seen from Fig. .2, the idler 41 does not mesh with the pinion40 at the be ginning of a downward movement of the operating bar 15, andit is necessary to bring these two pinions into mesh in order to drivethe accumulator wheel corresponding to the decimal order of thedepressed bar. The bar 14 is normally held in the position shown in Fig.2 by an arm 56 on the dog 51 which engages the upper end of a lug 57 onthe bar 14. When the dog 51 is operated by the cam bar 54 at thebeginning of the downward movement of the operating bar 15, the twocontact members 56 and 57 are moved out of engagement with one anotherand the spring 20 draws the bar 14 upwardly bringing the pinions 40 and41. into mesh with one anoth er as shown in Fig. 3. During the preliminary downwardmovement of the operating bar 15 and the upward movement ofthe bar 14 under the influence of the spring 20, it is apparent thatthere will be relative movement between the gear 17 and the rack 19 bywhich the gear 17 will be rotated. It is desirable to permit thispreliminary rotation oi? the gear 17 without transmitting the same tothe pinion 4]. and the parts driven there by. For this reason a portionof the gear 17 shown at 58 is left blank so that rotation of the pinion41 will not begin until the gear 17 has been moved by the preliminarymovement of the rack 19 a sufficient amount to bring the blank portion58 of the gear 17 past the pinion 41. During this preliminary rotationof the gear 17, the pinion 41 is held from rotation by a projecting rim59 on the gear 17 which operates with the projecting portions of twoalternate teeth on the pinion 41 in the manner of a Geneva lock. Theproj ected portions on the alternate teeth engage spaced portions on theperiphery of the rim 59 and. thus prevent rotation of the pinion 41. Thestepped plate 23 and the keys carriedv thereby are so related to thecooperating parts that each key is permitted a movement sutiicient toeffect this preliminary rotation of the gear 17 prior to the movement ofthe key necessary to rotate the computing mechanism an amountproportional to the number corresponding to the key depressed.

Zoe/hing mechanism.

If the spring 20 alone is relied upon to hold the bar 14 in itsuppermost position with the pinions 40 and 41 in mesh during therotation of the gear 17, it may sometimes happen that a quick strokeupon the key will cause a momentary downward movement of the bar 14 anddisengage the pinions 40 and 41 during portion oi their rotation. Itmight also happen where the spring is the only means for raising the bar14 that the operation of the spring: would not be suliiciently rapid tobrine the two gears into mesh before the blank space on the r 17 haspassed the jiinion 41. To overcome these rlifiiculties a rocking cam 60for each decimal order is journaled on, a shaft 61 which extendstransversely of the frame of the machine beneath the swinging bars. Thecam 60 is provided with a slot 62 which receives one end of a pin carried by the lower portion 01 an arm 64 extending downwardly from the bar14. At one side of the slot 62 is a shoulder 65 connected with the slotby an inclined portion 66 of the edge of the cam 60. A dog 67 journaledon the shaft-61 carries a detent 68 pivoted at- 69 to the dog 67. Aproject ing lug 70 engages a notch 71 in the periphcry of the cam 60 andholds the cam in the position shown in Fig. 2 so that the pin 63 engagesthe slot 62. A spring 72 holds the detent in engagement with the cam andalso draws the dog 67 downwardly, as shown in Fig. 2. The dog 67 isprovided with a shoulder 73 which extends into the path of a bar 7tcarried by the segment 21 on the operating bar 15. The detent 68 isprovided with an arm 75 which carries a pin 76, one end of which pinextends into a notch 77 in the cam 60, and the other end of which pin isin the path of an arm '78 on a bracket 79 which extends downwardly fromthe locking bar 16. The locking bar 16 is provided with an offsetlug 60projecting into an opening 81 in the bar l l, as shown in Fig. 2. Thebucket 79 is arranged to move up and down in slots 82 in a cross-plateS3 connecting the sides of the casing.

1V hen a key is depressed. immediately following the release of the bar1 1 from'the detent 56. the lower end of the bar 7 1 strikes theshoulder 73 rotating the dog 67 about the shaft 61. and the rotation ofthe dog carries with it the cam 60 because of the detent 68 until thecam is brought into the position shown in Fig. 3. This rotation of thecam will bring the shoulder 65 beneath the pin 63 and lock the bar 1% inits uppermost position with the pinions 40 and 41 in mesh. If the spring20 does not operate suiliciently rapidly to raise the bar 14, the barwill be positively raised by the beveled portion 66 of the cam 60 toinsure meshing of the pinions 40 and 1-1 prior to the rotation of theblank space in the periphery of the gear 17 past the pinion 11. The bar14 is held in this locked position by the cam 60 until the operating bar15 has been moved downwardly to bring the lower end of the depressed keyinto engagement with one of the lugs 30 on the locking bar 16. Thelocking bar 16 is held upwardly relatively to the bar 1 1 by a springSet connecting the bar 1 1 with the bracket 79. lVhen the depressed keystrikes the lug 30 further downward movement of the operating bar willextend the spring 84. and move the locking bar 16 downwardly relativelyto the bar 14 until the projection is brought into contact with thelower edge of the opening 81 in the bar 14. The parts are soproportioned that when the lug 80 engages the lower edge of the opening81, the numeral wheels will have been rotated an amount corresponi'lingto the number on the particular key depressed. During" the downwardmovement of the locking bar 16 relative to the bar 1 1, the arm 78 onthe bracket 79 is moved into engagement with the pin 76, and at thelatter part of the movement of the bar 16 relative to the bar 1 1, thelower edge of the arm 78 strikes the pin 7 6 and releases the detent 68from the cam 60. The pin 76 is caused to bear against the lower face ofthe notch 77 in the cam 60 so that the cam is rotated in acounterclockwise direction, as viewed in Fig. 3, until the notch 62 isagain brought into registration with the pin 63. The cam 60 reaches thisposition at the same time that the projection 80 strikes the lower edgeof the opening 81 so that further downward pressure upon the depressedkey will. move the locking bar 16 and the bar 14 downwardly in unisonwith one another, the notch 62 being in position to permit such downwardmovement. After the release of the bar 1 1 by the movement of the cam60, the three bars 1 1, 15 and 16 will move downwardly in unison withone another since the locking bar 16 is pressed downwardly by the key onthe operating bar 15, and the bar 14 is pressed downwardly by the lug 80on the lockingbar 16. During this movement of the three bars in unisonwith one another there will, of course. be no rotation of the gear 17since there is no relative movement of the bars, and the pinion 41 willbe moved out of engagement with the pinion 40 after the rotation of thegear 17 has ceased.

hen the spring 84 alone is relied upon to hold the locking bar 16 incontact with the tail piece of the depressed key during the movement ofthe locking bar relativeto the bar 14, it is sometimes possible tostrike a blow upon the key in such a manner as to cause the locking bar16 to bound away from the key and thus reach its lowermost posi tionrelative to the bar 1 1- ahead of the movement of the operating bar 15.If this should occur it is apparent that the cam 60 would be released bythe operation of the arm 78 on the bracket 79 prior to thecompletion ofthe movement of the operating bar 15 and the rack 19 relative to the bar14 and the gear 17. In order to prevent relative movement between theoperating bar and the locking bar 16 subsequent to the contact betweenthe tail of the depressed key with the lug on the locking bar 16 adetent 85 is pivotally mounted at 86 on the end of the bar 16 and isprovided with a tooth 87 arranged opposite a series of notches 88 in theedge of the bar 7-l. A downwardly extending arm 89 on bar 14 is providedwith an inclined cam surface 90 which engages a projecting lug 91 on thelower end of the detent As soon as the locking bar 16 begins to movedownwardly relative to the bar 14, the detent 85 is swung to the left,as viewed in Fig. 3, and caused to enter one of the notches 88 in thebar 7 4, as shown in Fig. 4. This will lock the two bars 15 and 16against movement relative to one another and prevent unlocking of thebar 14 prior to the completion of the downward movement of the operatingbar 15 and the rack 19.

Printing WtEOhtflLiSWZ.

Each of the bars 14 carries near its forward end a pivot pin 02 on whichis rotatabl'y mounted a numeral wheel 03 having raised type SE4 thereonwhich bear the numbers from zero to nine. Connected with each numeralwheel 93 to rotate therewith is a pinion 95 meshing with a pinion 96which in turn meshes with the pinion 41 driven by the gear 17. By thischain of gearing the iutuneral wheel 93 rotated in unison with theaccun'iulator mechanism and the type are arranged on the numeral wheel93 so that for any position of the wheel the lowermost type thereon willcorrespond to the number on the key depressed. The final downwardmovement of the three bars 14, 15 and 16 in unison with one anothercarries the lowermost type on the wheel 93 into engagement with thesurface of the paper in a roll 97 carried on a shaft 98, as shown inFigs. 2, 3 and 4. An inking roller 99 is supported by a spring 100 andis pressed against he t'ace of the type on the numeral wheel 93 so thatwhen a type is caused to strike the paper 97 the number will be printedon the paper. The roll of paper 97 is held up wardly in position toreceive the impre sion of the type by springs 101, Fig. 1, which areconnected with the outer ends of the shaft 98 which extend through slots102 in downwardly projecting arms 103 on the casing 12. The lower end ofthe slots 102 are enlarged, as shown at 104, to permit removal of theshaft 98 when it is desired to renew the roll of paper 97 on the shaft.The end of the strip of paper wound upon the roll 97 extends through aslot 105 through which the paper may be drawn after a computingoperation and the portion bearing the printed character-s torn oil. Inorder to properly aline the type on the numeral wheel 92; at the timethey strike the paper, a star wheel 106 is connected with each numeralwheel and its driving pinion and a dog 107 is pivotally mounted at 108on the end of the bar 14 and is provided with a tooth 109 arranged toenter the notches in the star wheel 106, as shown in Fig. 4, in order totrue the numeral wheel 93 if it should be slightly out of alinement dueto lost motion in any of the parts of the driving mechanism. The dog 107is moved into engagement with the star wheel 106 by a stationary shaft110 which contacts with the rear edge of the dog 107 as the printingmechanism is moved downwardly by the downward movement of bar 14, asshown in Fig. 4.

After hey has been depressed to the limit oi its movement and the numbercorresponding to the key has been impressed upon the paper, the key isreleased and the springs 20 and 22 begin to draw the bars 14 and 15upwardly. After the bar 14 has been raised sufficiently for the numeralwheel 03 to clear the paper, the bar 14 is arrested in its upwardmoven'ient by a detent 11.1 pivotally mounted on a shaft 112 extendingtranswersely of the frame of the machine.

The detent 111 is provided with a shoulder.

113 which engages a shoulder 114 on a down wardly extending arm 115carried by the bar 14. A spring 110 presses the detent 111 intoengagement with the arm 115. When the bar 14 is arrested in its upwardmovement, the bar 15 and rack 19 continue to travel up wardly, and thusthe gear 17 and the con nected chain of gearing is driven in the opposite direction from that in which it was rotated during the downwardmovement of the operatin bars. This reverse rotation of the gear 17 willreturn the numeral wheel 93 an amount equal to that which it was drivenduring its downward movement and thus reset the numeral wheel at itszero position. As soon as the gear 17 has reached its initial or zeroposition a pin 117 on the face of the gear will strike the upwardly extending end 118 of the detent 111 and move the shoulder 113 of thedetent out of engagement with the shoulder 114 on the arm 115. This willrelease the bar 14 and permit it to move upwardly a slight distance tobring the stop members 56 and 57 each into engagement with one another,as shown in Fig. 2, leaving the bar 14 in its initial position. In orderto insure positive move ment of the stop 56 into the path of the stop57, the dog 51 is provided with an arm 119 having a nosepiece 120 whichis struck by the upper end of the cam bar 54 and moved to the right, asviewed in Fig. 2, to positively restore the dog 51 to its initialposision. It will be noted that during the resetting of the printingwheels 93, the operating gears are disconnected from the accumulator sothat the number added to the accumulator will remain in the total whichit shows.

in order to prevent overthrow of the accumulator, a series of detents121 are pivotally mounted on a shaft 122 and are provided with teeth 123in position to engage the notches in the star wheels 42. Springs 124normally hold the detents in engagement with the star wheels. Each of.the detents 121 is provided with a laterally projecting lug 125 whichoverlies the detent of the next lower decimal order so that when any onedetent is raised out oi contact with its star wheel it willcorrespondingly raise the detents of all of the higher decimal orders.The downwardly projecting tail pieces of the detents 121 are providedwith laterally extending lugs 126 in position to be engaged by lugs 127extending, upwardly from the bar 11 of the next lower decimal order, theupwardly extending lugs 127 being offset laterally to bring them intoposition to engage the lugs 126 of the detents ofthe decimal order nexthigher than the one corresponding to the bar 11 on which the particularlug 127 is carried. By this arrangement when the bar 1% is movedupwardly to cause the pinions e10 and 41 to mesh with one another, thelug 127 will engage the detentof the next higher decimal order, and thedetents of all the higher orders will thus be raised out of contact withtheir corresponding star wheels, but the detent out the ordercorresponding to the bar 1 1 which raised and which carries the drivingmechanism being operated will remain in engagement with its star wheel.There is no danger of displacement of the numeral wheels oft-he higherdecimal orders during the time their star wheels are released by thecorresponding dogs for the reason that each numeral wheel is helc fromrotation by the carrying mechanism engaging the locking discs 413 and44: of the next lower decimal order. It is desirable to release the starwheels from their dogs in order to permit easy carrying from the lowerdecimal orders without the necessity of overcoming the tension of all ofthe overthrow dogs. It is also desirable to have the overthrow dog ofthe particular numeral wheel which is being operated in contact with itsstar wheel, for this numeral wheel as has previously been explained isdisconnected from the carrying discs of the lower decimal order andwould therefore be liable to overthrow if it were not for the overthrowdog. In order to make the action of the overthrow dog absolutelypositive, a beveled tooth 128 is formed on the bar 14: in position tostrike a corresponding, tooth 129 on the tail piece of the dog 121 sothat when the bar 11 begins to move, downwardly to disengage the pinions40 and 41, the dog 121 will be positively moved about its axis 122 andforced into engagement with the star wheel so that any tendency tooverthrow is positively checked.

A 001mm Za tor re verse.

As shown in Figs. 4;, 5 and 9, a shaft 130 which carries the pinions 10is supported by swinging brackets 131 pivotally mounted on the shaft 39and normally drawn in a counterclockwise direction, as viewed in Fig. 9.by a coil spring 132. Secured to one of the brackets 131 is a ratchetmember 133 having two notches 13=l and 135 therein. A dog 136 isprovided with a tooth 137 for engaging the notches 13a and 135, thetooth being drawn toward the notches by a spring 138. fhc sides of thetooth 13? and notches 13st and 135 are rather abruptly inclined so thatthe shaft 130 is held in position with considerable firmness, but may bemoved about the shaft 39 as an axis if sui'iicient lateral force isexerted to move thedog 136 out of engagement with the notches 131 and135. One end of the shaft 130 projects through a slot 139 in the casing12 in position to be grasped by an operator and swung about the shaft 39as an axis to bring the dog 136 into engagement with either of thenotches 13st or 135, as the operator may select. hen the shaft 130 is inthe position shown in Fig. 3, the accumulator will be operated, aspreviously explained, to add a number set up in the keyboard to thatpreviously displayed through the slot 33. If, however, the shaft 130 isshifted tothe right, as viewed in Fig. 3, which would be to the left, asviewed in Fig. l, the pinion 10 will be moved into position to mesh withthe pinion 96 instead of the pinion -11, and when this occurs it will beapparent that the accumulator will be operated in a reverse orsubtracting direction when a key is depressed. Since the carryingmechanism will operate for either direction of rotation of the gear 38,it is apparei'it that when it is desired to subtract a number fromthetotal in the accumulator, all that is necessary is to shitt the end01 the shaft 130 away from the operator, as viewed in Fig. 1, and proceed in exactly the same manner as in adding. Means is provided forautomatically returning the shaft 130 and gears 40 to the addingposition after each subtracting operation so that the device willnormally be set for addition. This automatic resetting. to addingposition is accomplished by the tail piece 111 on the dog 136 which isprovided with a beveled tooth 112 in position to be struck by aprojecting pin 1 13 formed on the member 127 of the bar 141 in unitsdecimal order. \Vhen the bar 1 1 of. the units order is moved downwardlyto print the last digit of a number set up in the keyboard, the pin 1 13will strike the tooth 142 and move the dog 136 out of engagement withthe ratchet member 133 and thus release the swinging arm 131 which' willimmediately be drawn by the spring 132. into the position shown in Fig.9 it the device has previously been set in subtracted position. It thedevice has previously been operating in adding position, the spring 132will merely continue to hold the device in this position during theshort period that the dog 136 is moved out of engagement with theratchet member 133.

W' hen a series of numbers have been entered in the accunnilator andprinted on the paper of the roll 97, all that is necessary to clear themachine is to shift the shaft 130 into subtracted position and then set11 the total shown by the numeral wheels 32 in the keyboard. As soon asthe key corresponding to the units order of the number in. the.

accumulator has been depressed, the total amount of that number willhave been subtracted from the accumulator which will thus leave all ofthe numeral wheels of the accumulator at zero position. At the same timethat the subtracting operation is being performed, the total previouslyexhibited in the accumulator will be printed upon the paper strip whichwill new exhibit a ticket showing all of the items tabulated with thetotal appearing at the foot ot the tabulated column.

Paper feed.

In order that the various items may be spaced from one another on thepaper strip, it is necessary to feed the paper roll a short distancebetween each item printed. Since the units key is the last key to bedepressed in entering a number, the paper feed is actuated by this keyand is arranged to operate after the key has reached the limit of itsdownward movement and is returning to its normal position. As shown inFig. 9, the cam bar 54 attached to the units bar 15 is shaped somewhatdifferently from the correspondin cam bars of the other decimal orders,as is also the dog 51 by which the bar 14 is held in its normalinoperative posit-ion. Since the numeral wheel in the accumulatorcorresponding to the units bar 15 is not connected with the lowerdecimal order by the carrying pinion, the dog 51 is not extended abovethe shaft 52 for the purpose of sup porting such carrier pinion. Itis,however,

provided with a catch segment 145 which is rigidly secured to the dog 51and which is provided with anotch 146 arranged to be engaged by a tooth147 on a detent 148 pivoted to the side of the frame at 149 and drawndownwardly toward the segment 145 by a coil spring-150. At the beginningof the downward movement of the bar 15, the dog 148 which is heldupwardly by a pin 151 on the cam bar 54 is released and contacts withthe segment 145 at the right of the notch 146, as viewed in Fig. 9.Further downward movement of the bar 15 causes a cam member 152 toengage a pivotally mounted toot-h 153 on the end of the dog 51 androtate the dog and segment 145 in a cloclc wise direction. This releasesthe stop 57 on the bar 14 in the manner previously described, and alsoswings the segment 145 to bring the notch 146 into engagement with thetooth 147 and holds the dog 51 in the position into which it has beenrotated by the cam member 152. The segment 145 is provided with an arm154 which engages a pin 155 projecting laterally from a lever 156pivotally mounted on a pin 157 projecting from the side plate of thecasing. Journ aled to rotate on the pin 157 is a toothed wheel 158 whichbears againstthe surface of the paper roll 97 and rigidly connected withthe toothed wheel 158 is a ratchet wheel 159, and a pawl 160 is pivotedat 161 on the lever 156 and engages the teeth of the ratchet wheel 159.A second toothed wheel 162 meshes with the teeth of the wheel 1.58 andhas rigidly secured thereto a star wheel 163, both .wheels beingjournaled on a shaft 164. A tooth 165 on the lever 156 engages thenotches in the star wheel 163 and prevents overthrow of thepaper-feeding mechanism, as seen in Fig. 9. A comparatively strong coilspring 166 tends to rotate the lever 156 about the pivot 157 and causesthe pin 155 to bear against the end of the arm 154 and also presses thetooth 165 into contact with the teeth on the star wheel 163. hen the dog51 is shifted by the downward movement of the bar 15, the arm 154 willraise the pin 155 and rotate the lever 156 about the pivot 157 asuiiicient distance to cause the pawl 160 to engage the next forwardnotch in the ratchet wheel 159. At the same time the tooth 165 isreleased from the star wheel 163' and the parts are temporarily lockedin this position against the tension of the spring 166 by the detent 148which engages the notch 146 in the segment 145. The extra effortnecessary to overcome the resistance of the spring 166 during thedownward movement of the units key is not sufficient to be appreciablynoticeable to the operator, but suiiicient energy is stored in thespring 166 to feed the paper forwardly the necessary amount when thespring 166 is subsequently released. After the computing and printingoperation performed by the mechanism of the units order has beencompleted and the units key is released, the cam bar 54 will moveupwardiy and is permitted to pass the pivoted tooth 153 which yieldsagainst 105 the tension of a spring 167. As the bar 54 approaches itsuppermost position, it engages the detent 148, and hits it out ofcontact with the segment 145, thus releasing the arm 154 and the spring166, which immedi- 110 ately rotates the lever 156 in a clockwisedirection, as viewed in Fig. 9, and thus by means of the pawl 160 thetoothed wheel 158 is caused to rotate and feed the paper into positionto receive the next number. The 115 rotation of the segment 145 aisoswings the stop 56 into position to engage the stop memher 57 on the bar14 to hold the bar 14 in its initial position for purpose previouslydescribed.

In order to prevent depression of more than one operating bar at a time,a cross-bar 168 is provided adjacent the path of movement of thesegmental bars 21, as shown in Figs. 2 and 6, the upper edgeof the bar168 125 being provided with a flange 169 having slots 170 thereinthrough which the segmental bars 21 are arranged to slide. Pivotallymounted on pins 171 on the face of the bar 168 beneath the flange 169are stop members 172, the pivotal movements of which are limited by pins173 in the bar 168. The pivotal movement of the stop members 172 issutiicient to permit one of the bars 21 to pass downwardly between thestop members, but not suflicient to permit two of the bars to passbetween the members at one time. Thus after a key of one decimal orderhas been depressed, depression of a key of any other decimal order isprevented until the key first depressed has been returned to its initialposition.

The operation of the various parts has been described in connection withthe description of the parts themselves and it is believed that theoperation of the device, as a whole, will be readily understood. Inperforming a computing operation, all that is necessary. is to depressthe keys correv sponding to the digits of the various numbers to beadded; the depression of the last or units key of each number beingsu'iiicient to feed the paper so that the machine is in position toreceive the next number of the series to be computed. If it is desiredto subtract any given number from the total this may be done by simplyshifting the end of the shaft 130 prior to the depression of the keyscorresponding to the number to be subtracted; hen all of the numbers ofa given series have been listed, the shaft 180 may be shifted and thenumber appearing in the accumulator is then listed in the regular way,which operation will print the total of the numbers previously listedand will at the same time clear the totalizer and set the machine inreadiness for a subsequent computation.

I claim 1. In a computing device, an operating member, an inclined keysupport carried by said operating member, a plurality of keys pivotallymounted on said key support, stops arranged to be engaged by said keyswhen said operating member is moved, means for holding said keys out ofposition to engage said stops each key comprising means for swingingit'into position to engage its stop when said key is depressed, andmeans for preventing said key from swinging out of engaging positionwhile said operating member is being moved by said key.

2. In combination, a computing unit, relatively movable driving elementsfor operating said unit, means for moving said elements relative to oneanother dii'ierent amounts to introduce difi erent numbers into saidcomputing unit corresponding to the amounts of relative movement of saiddriving elements, and means for moving said driving elements in unisonwith one another after a relative movement sutiicient to introduce agiven number into said computing unit.

3. In combination, a computing unit, a pair of driving elements movablerelative to one another for introducing diflerent numbers into saidcomputing unit, means for limiting the relative movement of said drivingelements to an amount proportional to a number which it'is desired tointroduce into said computing unit and for ausing further movement ofsaid driving elements in unison with one another, and means forretaining the numbers introduced into said computing unit in a fixedrelation during continued movement of said driving elements.

4. In combination, a computing unit, mechanism for printing numbersintroduced into said unit, a pair of relatively movable driving membersfor said unit, and means for producing difi'erent amounts ofrelativemovement between said driving membersto introduce difierent numbers intosaid computing unit and for moving said driving members in unison withone another to operate said printing mechanism.

5. In combination, a computing unit, mechanism for printing numbersintroduced into said unit, a pair of pivoted bars associated with saidunit, driving gearing for operating said unit, one element of saidgearing being mounted upon one of said bars, and another element of saidgearing being mounted upon the other of said bars, means for producingrelative movement of said bars ditl'orent amounts to introduceditl'erent numbers into said computing unit, and means for moving saidbars in unison with one another with the elements of said drivinggearing in fixed relation with one another to operate said printingmechanism after the introduction of a number in said computing unit.

6. In combination, a computing unit, a pair of relatively movablemembers for operating said unit, and mechanism for im parting apreliminary movement to one of said members relative to the other toproduce a preliminary setting of said computing unit and for imparting afurther relative movement of said members relative to one another tointroduce a number into said computing unit.

7. In combination, a computing unit, a

till

another subsequent to said relative movement after the introduction of anumber in said computing unit.

3. In a computing machine, a computing unit, a pair of relativelymovable operating members for said unit, gearing carried by said membersand driven by the relative movement thereof, means for impartingrelative movement to said members, means for bringing said gearing intoposition to operate said computing unit during the first part of therelative movement of said oper-- ating members, means for limitingcausing the relative movement of said operating 11101'l'1l381f5 to anamount proportional to a number to be introduced into said computingunit after said gearing has been brought into position to operate saidcomputing unit, and means for causing said operating members to move inunison with one another to perform a further step in the operation o'tsaid computing machine after a number has been introduced in saidcomputing unit.

9. In combination, a computing unit, a pair of pivotally mounted barsmovable relative to one another for operating said computing unit, anda. third bar for controlling the relative movement of said pair of bars.

10. In combination, a totalizer unit, a pivotally mounted bar having agear movably mounted thereon for driving said totalizer unit, means :tormoving said bar to bring said gear into driving relation with. saidtotalizer unit, means for moving said gear on said bar for operatingsaid gear different amounts proportional to different numbers to beinserted in said totalizer unit, and means for moving said gear outotdriving engagement with said totalizer unit after an amount or"movement necessary to introduce a given number into said totalizer unit.

11. In combination, a. totalizer unit, a support having a gear thereonfor driving said totalizer unit, means for holding said support in oneposition with the gear thereon out of driving relation with saidtotalizer unit, an operating member movable relative to said support fordriving said gear, means crmtrolled by said operating member for movingsaid gear into driving relation with said totalizer unit during thefirst part of movement of said operating member, means for moving saidoperating member an amount proportional to a number to be set up in saidtotalizer unit after said gear is brought into operative relation withsaid totalizer unit, and means for causing said operating member andsupport to move in unison with one another to bring said gear out ofoperative relation with said totalizer unit after said number has beenset up in said support,

12. In combination, a totalizer unit, a pivotclly mounted bar having agear thereon arranged to move into and out of operative relation withsaid totalizer unit, means for holding said bar in position with thegear thereon out of operativerelation With said totalizer unit, anoperating bar movable relative to said gear-supporting bar, means forbringing said gear into operative relation with said totalizer unitduring the first portion of the movement of said operating bar relativeto said gear-supporting bar, means for moving said operating bar anamount proportional to a number to be introduced into said totalizerunit after said gear is moved into operative relation with saidtotalizer unit, and means "for causing said gear-supporting bar to movein unison with said operating bar to move said gear out of operativerelation with said totalizer unit after a number has been set up in saidtot-alizer unit.

13. In combination, acomputing unit, a gear for driving said unit, meansfor rotating said gear various amounts to impart ditferent movements tosaid unit, and means for transmitting movement from said gear to saidunit,arranged to permit a preliminary movement of said gear prior to theoperation of said computing unit by said gear.

14-. In combination, a computing unit, a driving device for said unit,means for operating said driving device various amounts to insertdifferent numbers in said unit, and connecting means between saiddriving device and computing unit arranged to permit a preliminarymovement of said driving device prior to the operatlon of said computingunit by said driving crevice.

15. In combination, a computing unit, a driving device for said unit,means tor operating said driving device various amounts to insertdifferent numbers in said unit, and a gear for transmitting movementfrom said driving device to said computing unit, said gear having ablank portion thereon to permit a preiiminary movement of said drivingdevice prior to the operation of said computing unit by said gear.

16. In combination, a computing unit, a gear for driving said computingunit, a support for said gear, a driving device for said gear arrangedto rotate said gear various amounts to insert different numbers intosaid unit, said gear having a blank portion thereon to permit apreliminary movement of said driving device and gear prior to theoperation of said computing unit by said gear, and means for moving saiddriving device an amount proportional to a number to be introduced intosaid computing unit after said gear has begun to operate said computingunit.

17 In combination, a computing unit, a gear for operating said computingunit, a

support for said gear, means for holding said support in one positionprior to a com- .puting operation, a driving device for said gear, andmeans for moving said support into a different position to change theoperative relation between said gear and said computing unit during thefirst part of the movement of said driving device.

18. In combination, a totalizer unit, a support having a pair of gearsthereon for driving said totalizer unit, means for holding said supportin one position with the gears thereon out of operative relation withsaid totalizer unit prior to a computing operation, means movablerelative to said sup port for driving the gears thereon, and means formoving said support to bring the gears thereon into operative relationwith said totalizer unit during the first part of the movement of saiddriving means relative to said support, the gears on said support havinga blank space thereon for permitting movement of one of said gears without transmitting said movement to the other during the portion of themovement of said driving device prior to the bringing of said gears intooperative relation with said totalizer unit.

19. In combination, a totalizer unit, a driving element for said unit,and gearing connected with said driving element and movable therebyrelative to the totalizing unit for operatively connecting said drivingelement with said totalizer unit for a portion of the movement of saiddrivingelement proportional to a number to be inserted in said totalizerunit said gearing being movable with said driving element out ofoperative relation with said unit after said member has been inserted insaid unit.

20. In combination, a totalizer unit, a driving element for said unit, aplurality of keys corresponding to differentdigits for moving saiddriving element to operate said unit and mechanism for operativelyconnecting said driving element with said totalizer unit during aportion of the movement thereof proportional to the number representedby the key employed for operating said driving element said mechanismcomprising rotary gearing operated by said driving element and movablein unison therewith out of operative relation with said totalizer unit.

21. In combination, a computing unit, a movable element for operatingsaid unit, means for setting said element in operative relation withsaidcomputing unit during a portion of the movement of said element sothat said computing unit will be operated by said driving element duringfurther movement of said driving element, and means for causing thedriving operation of said computing unit to cease while said drivingelement continues to move when said computing unit has been operated anamount, proportional to a number to be set up there in.

In combination, a computing unit, a driving device for operating saidunit, a plurality of keys corresponding to diti'erent digits for movingsaid driving device to operate said unit, mechanism for establishingoperative relation between said driving device and said computing unitduring a portion of movement of said driving device so that saidcomputing unit will be operated by said driving device during asubsequent movement of said driving device, and means for causing theoperation of said computing u" it to be discontinued after said drivingdevice has moved in operative relation with said computing unit anamount proportional to the digit represented by the key depressed.

23. In con'ibination, a computing unit, mechanism for operating saidunit, means for holding said operating mechanism in driving relationwith said computing unit during various amounts of driving movement ofsaid operating mechanism, and a lock for said holding means arranged tocontrol the duration of operative connection be tween said unit and saidoperating mechanism therefor.

24. In combination, a computing unit, mechanism "for driving saidcomputing unit, a support for said driving mechanism movable into andout of position to hold said driving mechanism in operative relationwith said computing unit, and means for locking said support in positionto hold said driving mechanism in operative relation with said computingunitand means for releasing said lock after varying amounts oi operativeconnection between said computing unit and the driving mechanismtherefor.

25. In combination, a COJIIPUt'illg unit, driving mechanism for saidunit, a support for said driving mechanism movable into and out ofposition to hold said driving mechanism in operative relation with saidcomputing unit, a device movable relative to said support for operatingsaid driving mechanism, and a loclr controlled by said operating devicefor holding said driving mechanism in operative relation with saidcomputing unit.

In combination, a com 'iuting unit, driving Irechanism for saidcomputing unit, relatively movable members for operating said drivingmechanism. means for locking one of said members in fixed positionduring a movement of the other of said members proportional to a numberto be inserted in said computing unit and means for releasing saidlocking means when the movement of said other member has reached saidproportional amount.

27. In combination, a computing unit,

tit)

driving mechanism for said unit, means for shifting said drivingmechanism to bring it into operative relation with said computing unit,means for locking said shifting means in position to hold said drivingmechanism in operative relation with said con'iputing unit, a device foroperating said driving mechanism, and means for moving said operatingdevice to operate said driving mechanism an amount proportional to anumber to be inserted in said computing unit while said drivingmechanism is locked in operative relation with said computing unit andmeans for releasing said locking means at the close of a movement ofsaid driving mechanism proportional to the number inserted.

28. In combination, a computing unit, mechanism for driving said unit, aspring for moving said driving mechanism into operative relation withsaid unit, and a positively driven supplemental device for moving saiddriving mechanism into operative relation with said computing unit toinsure the completion of said movement at the proper time in a cycle ofoperation.

29. In a computing device, a computing unit, mechanism for driving saidunit, a device for operating said driving mechanism, means controlled bysaid operating device for positively moving said driving mechanism intooperative relation with said computing unit during a preliminarymovement of said operating device, means for locking said drivingmechanism in said operative relation, means for imparting movement tosaid operating device proportional to a number to be inserted in saidcomputing unit, and means for releasing said locking means at thecompletion of said proportional movement.

30. In combination, a computing unit, gearing for operating said unit, asupport for said gearing movable into and out of position to hold saidgearing in operative rela tion with said computing unit, means movablerelative to said support for driving sai'd gearing, and a locking devicecontrolled by said driving means for positively effecting the movementofsaid gearing support at a given time in a cycle of operation and forholding said gearing in operative relation with said computing unitduring a movement of said driving means proportional to a number to beinserted in said computing unit. a,

31. In combination, a computing unit, a pair of relatively movablemembers for operating said unit, means controlled by one of said membersfor imparting a preliminary movement to the other thereof. and asupplemental means controlled by said first mentioned member forpositively efi'ect'ing' the completion of said preliminary movement atthe properperiod in the relative movement of said members.

32. In combination, a computing unit, a pair of relatively movablemembers for driving said unit, a spring for imparting a preliminarymovement to one of said members to establish driving relation betweensaid relatively movable members and said computing unit, and means forpositively moving said member to insure the completion of saidpreliminary movement at the proper period in the relative movement ofsaid driving members.

33. In combination, a computing unit, a pair of relatively movablemembers for driving said unit, a spring controlled by one of said unitsfor imparting a preliminary movement to the other thereof to establish adriving relation between said relatively movable members and saidcomputing unit, and means for locking said springmoved member inposition to maintain said operative relation during a subsequentrelative movement of said driving members pro portional to a number tobe inserted in said computing unit.

34. In combination, a computing unit, a pair of relatively movablemembers for driving said unit, a spring controlled by one of saidmembers for imparting a prelin'iinary n'iovement to the other of saidmembers to establish operative relation between said driving members andsaid computing unit, means for positively eliecting the completion ofsaid preliminary movement at a predetermined time in the relativenioven'ient of said driving members and for locking the member so movedin position to maintain operative relation between said computing unitand said driving members during relative movement of said drivingmembers proportional to a number to be inserted in said computing unit,and means for releasing the member so locked at the completion of saidproportional movement to permit "further movement of said membersinunison with one another.

In combination, a computing unit, a pair of relatively movable bars fordriving said unit, and a lock operated by one 01? said bars forcontrolling the movement of the other of said bars relative to saidcomputing unit.

36. In con'ibination, a computing unit, driving mechanism for saidcomputing unit, a pivotally mounted bar for supporting said drivingmechanism, a pivotal'ly mounted bar for operating said mechanism, and alocking device for controlling the relative movement of said bars.

37. In combination, a computing unit, a, driving mechanism for saidcomputing unit, a pivotally mounted bar for supporting said mechanism, apivotally mounted bar for optil crating said mechanism, lockingmechanism for controlling the relative movement of said bars, and athird bar for controlling said locking mechanism.

38. In combination, a computing unit, driving mechanism for saidcomputing unit, a pivotally mounted bar for supporting said drivingmechanism, means for moving said bar to bring said driving mechanisminto and out of operative relation with said computing unit, a secondbar movable relative to said first bar for operating said drivingmechanism, locking mechanism controlled by the movementof said secondbar for holding said driving mechanism in operative relation with saidcomputing unit, and a third bar controlled by said second bar forreleasing said locking mechanism after said second bar has operated saiddriving mechanism an amount proportional to a number to be inserted insaid computing unit.

39. In combination, a computing unit, means for driving said unit, meansfor moving said driving means into operative relation with said unit, alock for holding said driving means in said relation, means foroperating said driving means While in said relation, and mechanism forreleasing said lock and for moving said driving mean out of operativerelation with said computing unit when said driving means has beenoperated an amount proportional to a number to be inserted in saidcomputing unit.

it). In combination, a computing unit, a pair oi relatively movable barsfor operating said unit, locking mechanism operated by one of said barsfor holding the other of said bars in a fixed position during a movement01" said first bar for driving said computing unit, a third bar forreleasing said lock, and keys movable with said first bar for contactingwith said third bar to release said lock when said computing unit hasbeen driven an amount proportional to a particular key depressed.

41. In combination, a computing unit, driving mechanism for saidcomputing unit, a spring-actuated device for controlling said drivingmechanism, and positively acting supplemental means for insuring properoperation of said spring-actuated device.

12. In combination, a computing innit, driving mechanism for said unit,springactuated means for controlling said driving mechanism, a devicefor operating said driving mechanism, and positively acting meanscontrolled by said device for insurin proper occurrence of the movementof said springactuatcd means relative to the movement of said operatingdevice.

43. In a computing device, a movable operating member therefor, lockingmechanism for controlling the movement of said operating member, adevice having a limiter movement relative to said member for controllingsaid locking mechanism, and resilient means for holding said controllingdevice at one extremity of said limited movement.

44. In a computing device, a movable operating member, a secondoperating member movable relative to said first member, a locls ingmechanism for controlling the position of said first member, thirdmember arranged to be actuated by said second member for controllingsaid locking mechzmii-m, and means for holding said second and thirdmember in fixed relation with one another during the IIIOVEIIJQDtof saidthird member by said second member.

as. I11 combination, a computing unit, a gear-shifting bar for saidunit, locking mechanism for said gear-shitting bar, an operating bar forsaid unit, a lock-controlled member arranged to be moved by saidoperating bar for controlling the locking mechanism for saidgear-shitting bar, and a detent for holding said operating bar andlocking member in fixed relation relative to one another during themovement of said locking member by said ope "ating bar.

46. In combination. a computing unit, gearing for driving said unit, abar for supporting said gearing and for shifting said gearing into andout of operative relation With said computing unit, an operating barmovable relative to said gear-supporting bar for operating said gearing,locking mechanism for said gear-supporting bar, means controlled by saidoperating bar for releasing said gear-supporting bar at the beginning ofthe moven'ient of said operating bar to permit said gear-supporting barto shift said gearing into operative relation with said computing unit,means controlled by said operating bar for locking said gear-supportingbar in said position, a,lock-controlling bar having a limited movementrelative to said gear-supporting bar, a spring for holding saidlock-controlling bar at one extremity of its limited movement, keys onsaid operating bar corresponding to ditlerent digits and arranged whendepressed to move said opera-ting bar relative to said gcar-siu'iportingbar and to engage said lOCli-COIltl'Ollilig' bar and move said bar torelease said locking mechanism, a detent carried by said loci;-controlling bar and arranged to engage said operating bar when saidlock-controlling bar is moved relative to said gear-supporting bar toprevent displacement of said lock-controlling bar relative to saidoperating bar d-ur-- ing the movement of said lock-controlling bar torelease said locking mechanism.

47. In combination, a computing unit comprising a totalizer Wheel and aprinting wheel, gearing for driving said wheels, mechanism for movingsaid gearing into one position to cause said Wheels to be operatedcorresponding amounts and for subsequently moving said printing Wheel toform an impression therefrom representing the number introduced intosaid totalizer by the rotation of said gearing.

48. In combination, a numeral wheel having type thereon, atotalizer,gearing for driving said numeral wheel, means for shifting said gearingto connect said numeral Wheel and. totalizer to operate in unison withone another, means for preventing rotation of said numeral wheel duringthe shi ftin g of said gearing, mechanism for driving said numeral wheeland totalizer While connected by said gearing an amount proportional toa digit to be inserted in a unit of said totalizer, and means forsubsequently moving said numeral wheel to print the digit inserted.

49. In combination, a totalizer unit, a numeral wheel having typethereon, a support for said numeral Wheel having gearing thereon fordriving said Wheel, said support being movable into position to connectsaid gearing with said totalizer unit, to drive said unit and numeralWheel in unison with one another, mechanism for operating said gearingto drive said numeral Wheel and totalizer unit an amount proportional toa number to be inserted in said totalizer unit and printed by saidnumeral Wheel, means for shifting said support to print said number, andmechanism for preventing rotation of said numeral Wheel during theshifting of said support.

50. In combination, a numeral Wheel hav ing type thereon, gearing fordriving said numeral wheel, a movable support for said gearing, atotalizer unit, means for shifting said support to connect said gearingwith said totalizer unit, mechanism for driving said gearing While soconnected an amount proportional to a number to be introduced in saidtotalizer unit and said numeral Wheel, means for shifting said supportto disconnect said gearing from said totalizer unit and to print thenumber thus inserted, means for preventing rotation of said numeralwheel during said shifting movements, means for Withdrawing said numeralwheel from printing position, and means for driving said gearing inareverse direction While said numeral Wheel is withdrawn from printingposition and While said gearing is disconnected from said totalizer toreset said numeral Wheel at zero position.

51. In combination, a numeral Wheel, a support for said numeral wheel,gearing on said support for rotating said numeral Wheel, an operatingmember for driving said gearing, means for shifting said operatingmember relative to said support to rotate said gearing an amountproportional to a number to be printed by said numeral Wheel and forsubsequently shifting said operating member and support in unison withone another to print said number, means for s1nfting said operatingmember in a reverse direction relative to said support to return saidnumeral Wheel to zero position, and means controlled by said gearing forpreventing ii'urther relative movement of said operating member andsupport after said numeral Wheel has reached its zero position.

52. In combination, a totalizer, means for printing numbers set up insaid totalizer, mechanism for operating said totalizer and for settingsaid printing means, paper-feeding mechanism, and mechanism for storingenergy during the operation of said printing means for setting saidpaper-feeding mechanism subsequent to the operation of said printingmeans.

53. In combination, a computing unit, a gear for drivin said unit, meansfor rotating said gear various amounts to impart different movements tosaid unit, means for transmitting movement from said gear to said unitarranged to permit a preliminary movement of said gear prior to theoperation of said computing unit by said gear, and means for shiftingsaid transmitting means into operative relation with said computing unitduring said preliminary rotation of said gear.

54. In combination, a computing unit, a driving device for said unit,means for operating said driving device various amounts to insertdifferent numbers into said unit, means for shifting said driving deviceinto cooperative relation with said computing unit and forsimultaneously operating said driving device, a second member operatedby said driving device, and means for transmitting movement from saiddriving device to said second member, said transmitting means beingarrai'iged to permit a preliminary movement of said driving device priorto the operation of said second member while said driving device isbeing brought into operative relation with said computing unit.

55. In combination, a computing unit, a gear for operating said unit andmovable into and out of operative relation therewith, a second memberoperated by said gear, and means for transmitting movement from saidgear to said second member, said transmitting means and gear beingarranged to permit a preliminary rotation of said gear during themovementof said gear into operative relation With said computing unit.

In testimony whereof I have signed my name to this specification on this18th day of January, A. D. 1919. I

OTTO MALGHER.

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